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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a6c2cafbec134453d70a1409b061bbca48b09d6862093f01b910d23be32685' 
  AND token = '4BCOnhTS/TfqWN5l0p4i6kHJmc12SoBmGva9xtXmv/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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