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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a099a0be6ad30e88038d9001b2e59d93db4995e2fd2753ef7272af1e8d453e' 
  AND token = 'RhNdfRTSGZrziRfI8aRDEtUkMJedF+RKwazUXlURpmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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