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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42a89b73c7058bdc1adaa3fd919a719313c90cc680ce3fb1e308d276a81ff58' 
  AND token = '4SiqkJF3ZpX75il6bf2wvB0i2ZRZyP9PNCd5QoBnSO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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