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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfdd87120883f3e7631504e50952cd3513282ff3209d300d05f8a1e7c280e87' 
  AND token = 'jNK1usbjTjyRs4fQ5LwVdRt5xlxcjTlworeUDcJk0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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