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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7569a82bf695e4fff40404240307d6b12d5fce0438de89e877e806eac0a93c' 
  AND token = 'd/k1KDtqvebH9t2DcndDDneBaxuMYN7WV+wmlFrcGJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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