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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631ad53d72872ba482e670fe2570a224690a3304551801ae2369234e84930933' 
  AND token = 'wh71HLLMWwQ7FnBLKNP/czzIF+KSQ1B5Ixhb8vnozSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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