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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6175fdd3f26e52598ccd33e1bc61b83e3080e77ca9c7e91fcde98651936795' 
  AND token = 'ZG73szkpSRmpY2J6+SGSU6z3Pdlmu34HqjhJhy1H/1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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