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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8194b7fd01f7f5856196545c0c9b465260491562d9daff36dd91d97a65690d' 
  AND token = 'Od4RjDoVdY65Y5KYvmG1ohA70ExvxbYKBB4mNOn6o+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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