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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5bdf346983855715a38b00dc6cd31a904617c45a9e1cbfb969f824ff5ed308' 
  AND token = 'bEqSvBkDuHTnU52Nbja58YEZcK/xdHvXpMhxcOF9AOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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