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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42b2f19482a7156552e7f02901351dc90b5baf6ae39bbc0825a8356ddd835e5' 
  AND token = 'bKLTuMRS+L5ZnJm73j2neN1cCTS5VJWQsN62EnYAIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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