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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6975b61f2bb8eea1333838d84a18c0b8fe9ec0d3e1d54984d88fe827801d7741' 
  AND token = 'Ul4SYh7HsyO+CJtHbsghIteEHgg+LB1sjAbZApu06Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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