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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5815774db0586bf894efa013c3da6408e978526acaab1ef5f6ead814404dce72' 
  AND token = 'GFkEVNNtqfKCgKE6Xo9eb9yul0A+TltzdQt7CFVnRqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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