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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f905945194a82a037d97c3d126840cd0c60a183914e993738b85c35d4dcb29d' 
  AND token = '1pLdlg+LLAEZoKfvpTTaf3Rpjf4p8Mk4p/DV2JcKsl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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