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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dda2d98a0b6b437d6814b16f6346510ce642a50db3e73e2db90084717a84a35' 
  AND token = 'SaU3U7FfGpDzXDJQv+GHAnrq8Tkce+Dm+r0ASrSOOpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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