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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc32208da63e0913351aefc452209de22c1fa7ae4a5a745acfea1f4b2c7845f' 
  AND token = 'CALJ8oIpHgtyLrOLo3zbYj2nHixgxLNcJVRogxC1JiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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