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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb997e1c2502ca3affd0ccf5b3c8ac2a3999f491b9e70e35e76a48ee32a2fad4' 
  AND token = 'nK1qyH/w04bNJcwkOiIWARQHimLZxobAL84CSKaF5XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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