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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2897a81028893657b2dbdd5592ae332aa7d52aa0fae9d2423341ef773f52111' 
  AND token = 'jHzmNYFRpnLVD2XIZPUmcuqfDZzR2svlZELcqQLHsXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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