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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeae353f9f7952df799b5c42e2789644047934bd1c52f2001e7f4eba2a948f3' 
  AND token = 's2NzhxoI90PCuF5zkV8tPIbUPP4AWc5LlZvxFN7qRXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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