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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8d5d854d54a60bbc2eb5bc4bbb5a07e8f2c58a3ce18eae8e4827322a1f8ecf' 
  AND token = '+uL/xIgjr+SK3nhIcGYr204ErZ0Izr+woijr9aDEePo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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