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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ce59086468a8feebbde2132ff6863bb2c6ab54b6e8041f0080f8a9cd4ff358' 
  AND token = 'LbZsSh6SxuvFXt9jl9UlS+Uw+u7rfyzyGDQXecvNWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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