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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa86cffe5a466d03a1625dec9ee24afd45dbe1790a60b211f08a035242e3d392' 
  AND token = 'dBQAnz0JbNFJkiu6vk73522USTuQF0Ey2UPyfq9kOfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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