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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8783f52f85c690847dab88f4f5be85ed17d787709ffb5741678b84ec2a69373f' 
  AND token = '6m54/a0YAMCFPV/hZiFE/AdQO91jW9m30yv+ar5dGFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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