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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7a6619d40342f897de78f4deface3352f871e0d800108e8a12101daf5cd21c' 
  AND token = '0CXRouYEeFj+6yDccKkLp4ejc6NTlYCK31+ah7BzYbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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