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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da662f734417a2603721d1ce7ff755febcea8562e3b4389036e2a4840a507a25' 
  AND token = '6xXb6w7/Vx8TOAAy8DzAFHwBx1U+8sh0lPjLj95tM04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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