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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1189dff6a0b0bae00e83b5d88ddf9e631924cce349d3b853850f9e531e069d9e' 
  AND token = 'zn/ZtC5Rw8vjeTDRe5MF2UnQXDuTJA78Hm36dH8kVIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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