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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef44b13ee0e2831150decf6bab3b04b3120a6b1c09da61834388030dad30b95' 
  AND token = 'LR9wu9w3FmLfjzFvvcynOaEDISHwb3458aS7N/ku/eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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