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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2152feda86b2eb8982b5cc440edaad3feb7f52647732ca6854e1129c3eb6147' 
  AND token = 'QQNH51L3G13CemvtDMBUKpL0h+k/VpUUEiVMUMiHU+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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