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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1963bdee39986183e504ba8c95eb56199491dc8d504de09e0edf9faa4c13fb' 
  AND token = 'eNpNpq0AOslBUkyQvNMZjXlcHqw80s4g/yR2IMVw3JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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