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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75cc78b85292abd1d66064810903774ee83d60f9b307a4f825c522c081cc61e' 
  AND token = '9m8tSWIdHZMC8O0tcv0DXqMMSGXhzhU3wiE8ovIlzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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