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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f20b2c44860c7b08d4dd40b3e9ab9f23c12a6f194c2c1e5d59d2f440e3f531' 
  AND token = 'ENhQyqa6pLamh6RFwOXgPdIGcq08pXRBFpmFlPKoJX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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