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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188d5c1e3e8898bf74cf8e10961508c00d74d47ceea1ae0941c9f649875e14fb' 
  AND token = 'ACbzDYa9pFt5RpIbaGoAx/9pfojkwfJCehDZ2r3R3UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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