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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa10f92d2d090746ba81d896d4fd77d516474378e93fce80ce592fadd2ab0f2' 
  AND token = 'UQDVS8IoDOZm6q07be7TTkP5CHZ7ZDvcu3IMZpI+OjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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