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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049fa4e1d938465276ce948b7205062b9acb2b9eb91bf3e0b2213d40477fbf67' 
  AND token = 'meAhHkMIoL8jmhE1iNI76LxefsHw0XvoxjTszd5Dr2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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