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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f642ec65d777070af34cf89ec7189647d002530a2786918142f0d0e22aac18b7' 
  AND token = 'dzQMuu0EM5B4aHclMu1aisP17VIG05hRUiEMV0f/1lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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