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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681df066bebc3769b5f1842ec42d01f64f0a8d9a0e5b0183c21a5403217881b6' 
  AND token = 'Q6HbKANmgQsZZ0cUUcNyL1lMUgR5rR/xhM2DipUeuLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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