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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8accee5e5823d744721b27358244e6a7bd2e13366598823bf81c4953f828de57' 
  AND token = 'QB6unzp0fH+esLKr/z/AWGbi8dtuYkxPF4KPk8itD1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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