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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760f8175b1b670554fabc5554f9e883beddee6c499882804b4624860b0e3d1b6' 
  AND token = 'rB6TohmRlyg26O17kG41dDaMucX8fuy220+bF4RuKGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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