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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84ba43b27c771ab12f15da723ed1e4ba6eed9252cb0e694edfc67d33be53f03' 
  AND token = 'j0vZlavaoX5S+Kx5SgfsJa12JKA1PTUnE9SGzG/wBa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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