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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934b9b098269e918e9ca126244e82c92af5e825a026accd937b53251a430f4f9' 
  AND token = 'NS9AQX49b+H88aYx+6eo7m4VoxU49c+rlvXikgkp+2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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