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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79e514a9fadbac277dc9f6d7f586780f30ce0320de440f5e0bf8bb51e3cb805' 
  AND token = 's+lllqJp52YW7ttm64RNWib1sHPmbMQ6t4DCvXdhA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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