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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1a4755153fdce995dde35026f30417d3c608623e9f19d0b0e3bbf7246479fd' 
  AND token = '7c8dpPDkIFTl/72VRwIaCtTzaPTVbpVhe+UpeHw/l9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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