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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a117e596f222607570b5e99fee2c8708478cbc88e364d775ba5926950528828f' 
  AND token = 'DpcSv4dFt1kaVAyOAx9nAIbso/6S6aeIx0PQOfaHmmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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