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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0952dd2290d52cdebd0e08ef84ced033c47e41d5f0a225a699c62aabfa55cff' 
  AND token = 'pF6Thb2vJhSIVi+Q68ZGzzhvvddam3qzgTUxNUT+o2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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