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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6336128e7f3a8cf7451942fe8c490d7f34b35871e2f4778bf2741581a65b0de' 
  AND token = '4KGpXV5RJbsAA6L01b605iX0izKw9+m7xNx8iSfGE0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}