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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347f279f5e1ca4d826ea49abc943be220d6f645a8d0dc9525d4bf3eaa882bccc' 
  AND token = 'fiXPUoSFkhHcOYKFfY7pOc0Y2DUjK/jhfLrDeNh0r8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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