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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5e53864ded2a23555097c4514559657116094245b27a5636e7ae7f48946380' 
  AND token = 'P4KY/Ad3+1YRcqfrr1lSnhczTsQyFawE5YfpZM7BSNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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