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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f13d7d6c47c24ba07e5cf05983bd641e292a51b566d7865d89910cd6d0fa643' 
  AND token = '6Bk94n+4jAgbP0w5EU23MCK59g2DO089O0AwPl2L0K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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