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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c7e3788ac2e46ee3af41558a45588b2f94262c24d9554e2453700ac2507f79' 
  AND token = 'z/vfVp2+fNxzzgDX48h+R3vdbHCcVoZmeuDyTyncLFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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