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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7f2c330def12e34694b1a0b10b071f355bce9d03c3f098046438ff7fbaae5b' 
  AND token = 'nT0z7PyJqUpM/oLaljvCkBpn4liKU64Gn09M/ElnX18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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