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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b0178c1752253da8a748010c398c22ff91f4c983cb70f8f8e9b6c38082330c' 
  AND token = '/PcElV/+ooeLXaiKEMkSTmrdymhSrUxpPrRdeC4zBoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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