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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3760957788205094fa0c47f647ce2bdb9e7d0b91f612dfbdfca826e2a4d697cc' 
  AND token = 'BPBwv69TKph1vBCp+trKMnsXqRpKWLvXoeO2Bb262Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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