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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef9a2c6b0785bdd9bc509bc88cfb23f88fe1f2976728cc512929c9fc2b9efd8' 
  AND token = 'tt0M4VK66PfmGg7SpNOFIBfPp+4BAPsk3ym9YPIxojw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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