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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01d3ccc87fa65d3791399ea733617e0a035d7aaa55791dec9135c39f7d8eb02' 
  AND token = '6ZraB4YltkoHOIFG2F3BY1L3uVrCwreG38N3s2Yf14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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