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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b4893b9b66adc5549179a89d749f377fe0591ae61f3b6648fbc1781fe9a23b' 
  AND token = 'Z8KT04NuGbWtYdAp//9e1Dg5rWAm6GRCSBbPnyPkVRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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