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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd30e8f9da1a7aa6b075f2bcd08a25f5670e9a725727b95fcdf7cd9a7861566e' 
  AND token = 'f/3pedzUUHVLdL8PeIgL5e03rzhXaw1+02gA5sOul6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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